the main flat portion of the rudder which provides the necessary surface for the impinging action and side pressure of the water.It is attached to a vertical shaft,the rudderstock,by which it is actuated.
... ahter hõlmab kere veekindlaid konstruktsioone, ahtripeeglit, puppi, traali rampi ja umbreelingut, kuid mitte kaitsereelingut, käiturit, roolilehte, tuukritreppi ja platvormi
